Ubisoft announces that Dark Messiah of Might and Magic is gold, and the
action/RPG based on the Might and Magic strategy series is due in North American
stores on October 24:

SAN FRANCISCO – October 9, 2006 – Today Ubisoft,
one of the world’s largest video game publishers, announces that Dark Messiah of
Might and Magic™ has gone gold and is scheduled for North American release on
October 24, 2006.

Developed in conjunction with Ubisoft, Arkane Studios (for single-player) and
Kuju Entertainment (for multiplayer), Dark Messiah of Might and Magic puts
players in a first-person perspective, allowing them to encounter ferocious
combat within a dark and expansive fantasy environment.

Powered by an enhanced version of the award-winning Source™ Engine created by
Valve for its Half-Life®2 video game, Dark Messiah of Might and Magic allows
players to immerse themselves in an environment that responds and envelops them
like never before, thanks to the Source Engine’s exceptional technological
enhancements in areas such as character animation, advanced AI, real-world
physics and shader-based rendering.

Dark Messiah of Might and Magic will be available for PC at the manufacturer's
suggested retail price of $49.99.

For more news and information on Dark Messiah Might and Magic, please visit the
game’s official website at
www.mightandmagic.com.

I don't know what percentage Valve is getting here, but in the past it has gotten 50% which is a hell of a lot especially when the game in question was neither funded by Valve nor used the Source engine.

FYI, if "the game in question" is still Dark Messiah, then it most certainly does use Valve's Source engine. It even points this out in the press release above.